CHEM 103 Lab Exams 2026 (PDF) | (2026/2027) Experiments 1–8 Questions | Lab Test, Exams of Nutrition

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CHEM 103

GENERAL CHEMISTRY I

LAB EXAM 1 - 8

Actual Questions and Verified Answers

Portage Learning, Geneva College

Inside you will get:

1. Multiple Choice Questions (MCQs)

2. Short Answer Questions

3. Data Analysis

4. Practical Identification or Application

5. Experimental Design or Procedure Questions

Lab Exam 1- Requires Respondus

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Instructions

Please read the following before beginning the exam:

● You will NOT be recorded via webcam for lab exams. You will not be prompted to show your ID or do an environment scan. However, you will still need to take the exam using LockDown Browser. ● You must show your work for calculations or give an explanation for short answer questions in order to receive credit. ● You may only use the methods and explanations provided by this course for your answers.

● You MUST use the Periodic Table provided by the course.

● The use of printed versions of the Periodic Table and will be considered a violation of the Academic Integrity Policy. ● Your lab notebook and/or lab report should be used when taking the exam. You may either print it out or use handwritten notes. You must show both sides of your lab notebook and/or lab report during the room scan. If you fail to show your lab notebook or lab report, but it is clear you are using some form of notes, it will be considered a violation of the Academic Integrity Policy.

● During lab exams you may not use any outside source of information such as the module, problem sets, Internet, tutor, etc., with the exception of your lab notebook/report mentioned above.

● You may only copy and paste from within the exam itself or from the provided calculator but not from an outside source.

● The only items you should have in front of you are the exam itself, 1-2 pieces of blank scratch paper, a pen/pencil, a calculator (non-cell phone), and your lab notebook/report.

Scientific Calculator

Answer the following five questions:

1. What is the device shown below?
2. What is the wire device put under container to spread the heat?
3. What is the weighing dish used for solids?
4. What is the temperature scale used in the chemistry lab?

Question 1

4 / 10 pts

1. The mass of the graduated cylinder on analytical balance #2 was? grams.
2. The mass of the metal cylinder on analytical balance #1 was? grams.
3. The mass of the cell phone on analytical balance #3 was? grams.
4. The mass of the graduated cylinder on analytical balance #3 was? grams. Your

Answer:

1. Single pan balance
2. 47.6214g
3. 21.5953g
4. 92.9748g
5. 47.6219g

1. The balance shown below is a top-loader (single pan) balance.
2. The mass of the graduated cylinder on analytical balance #2 was 47.6214 grams.
3. The mass of the metal cylinder on analytical balance #1 was 21.5953 grams.
4. The mass of the cell phone on analytical balance #3 was 92.9748 grams.
5. The mass of the graduated cylinder on analytical balance #3 was 47.6219 grams.

Scientific Calculator

Answer the following three questions:

1. Which of the devices was determined to have the smallest % error in volume delivered in lab 1?
2. What was the calculated volume for the 100 ml graduated cylinder in the volume measurement experiment?
3. Water at 23.9oC has a density of 0.99732 g/ml. A 10.2 ml sample of water at 23.9oC, delivered from a graduated cylinder had a mass of 9.8851 grams as measured on an analytical balance. (1) Show the calculation of the actual volume as determined from this mass. (2) Show the calculation of the % error in volume delivered for this graduated cylinder.

% error = (│delivered value - calculated value│/delivered value) x 100 Your

Answer:

1. The Pipet
2. Mass = 10.

Mass 10.3802 divided by Density 0.99791 = (Volume)

Question 3

8 / 10 pts

10.40ml

Lab Exam 2- Requires Respondus LockDown

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Fill in the blanks:

1. A reaction which gives off heat is said to be exothermic.
2. A decomposition reaction has more products than reactants.

Answer 1: Correct! exothermic

Answer 2: Correct! decomposition

Fill in the blanks:

The reaction of NaHCO 3 with HCl is a acid base double displacement type

Question 2

10 / 10 pts

Question 1

10 / 10 pts

reaction. During the reaction of NaHCO 3 with HCl a colorless (color) gas

(state) is formed.

Answer 1: Correct! acid base double displacement

Answer 2: Correct! colorless

Answer 3: Correct! gas

Fill in the blank:

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Question 3

10 / 10 pts

Lab Exam 3- Requires Respondus LockDown

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Answer the following two questions:

1. Why was the hydrate heated with the Fisher burner in part 2 of lab 3?
2. For what purpose was SEM carried out in lab 3?
3. The hydrate was heated with the Fisher burner in lab 3 to cause loss of water.
4. The SEM was carried out in lab 3 to detect the elemental composition.
5. The SEM was carried out in lab 3 to detect the elemental composition. (We did not use it for imaging)

Scientific Calculator

Answer the following question.

A 1.1000 gram hydrate sample chosen from Na 2 CO 3 ∙10H 2 O, AlCl 3 ∙6H 2 O, MgCl 2 ∙6H 2 O and BaCl 2 ∙2H 2 O was heated and found to lose 0.6920 gram of H 2 O. (1) Show the calculation of the % H 2 O in the unknown hydrate sample. (2) Show the calculation of the % H 2 O in each of the (^) hydrate compounds and identify the unknown hydrate

Question 2

10 / 10 pts

Question 1

5 / 10 pts

Answer the following two questions:

1. A paper chromatography experiment was conducted on a mixture of amino acids including Aspartic acid (Asp), Glutamic acid (Glu), Histidine (His), Leucine (Leu), Phenylalanine (Phe) and Proline (Pro). The following Rf values were determined: Asp (0.245), Glutamic (0.275), His (0.295), Leu (0.745), Phe (0.685) and Pro (0.445). In the experiment, a colored spot for unknown amino acid "U" was found centered at a distance 53 mm from the start line when the solvent line had travelled 78 mm. (1) Show the calculation for the Rf value for amino acid "U" and (2) identity amino acid "U".
2. Which of the following is the formula of unknown #5 which gives the following SEM spectrum. Explain your answer. Pb(CO 3 ) 2 Pb(HCrO 4 ) 2 PbO 2
3. Rf for U = 53/78 = 0.679 matches best with 0.685 (U = Phenylalanine )
4. Pb(HCrO 4 ) 2 is unknown #5, H cannot be detected by SEM.

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Scientific Calculator Answer the following three questions:

1. (3 points) A student conducted an experiment where she mixed 75 g of tap water (25.0oC) with 75g of warm water(35.0oC). The final temperature of the mixture was 28.0o How much heat was gained by the tap water if the specific heat of water is 4.18 J/K-g?
2. (3 points) In one experiment in the video, HCl was mixed with another substance. What other substance was mixed with HCl?
3. (4 points) One student conducts an acid-base reaction where he finds the following results. What is the enthalpy of the reaction (in KJ/mol)?

Heat gained by solution 3875 J

Heat gained by calorimeter

112 J

Question 2

3 / 10 pts

Moles of product formed 0.

mol

2. NaOH (sodium hydroxide)

1. 31.896 KJ or 31.9 KJ

Total heat = Solution heat + Calorimeter heat (total heat produced)

Total heat = 3875 J + 112 J = 3987J or 3.987 KJ

Enthalpy of reaction = Total heat gained/moles of product Enthalpy

of reaction = 3.987 KJ/0.125 mol

= 31.896 KJ/mol

Scientific Calculator

Answer the following three questions:

1. (3 points) What are the products of a combustion reaction?

Question 3

10 / 10 pts